linux/drivers/net/ethernet/microchip/lan743x_ptp.c

/* SPDX-License-Identifier: GPL-2.0+ */
/* Copyright (C) 2018 Microchip Technology Inc. */

#include <linux/netdevice.h>
#include "lan743x_main.h"

#include <linux/ptp_clock_kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/net_tstamp.h>

#include "lan743x_ptp.h"

#define LAN743X_NUMBER_OF_GPIO			(12)
#define LAN743X_PTP_MAX_FREQ_ADJ_IN_PPB		(31249999)
#define LAN743X_PTP_MAX_FINE_ADJ_IN_SCALED_PPM	(2047999934)

static bool lan743x_ptp_is_enabled(struct lan743x_adapter *adapter);
static void lan743x_ptp_enable(struct lan743x_adapter *adapter);
static void lan743x_ptp_disable(struct lan743x_adapter *adapter);
static void lan743x_ptp_reset(struct lan743x_adapter *adapter);
static void lan743x_ptp_clock_set(struct lan743x_adapter *adapter,
				  u32 seconds, u32 nano_seconds,
				  u32 sub_nano_seconds);

int lan743x_gpio_init(struct lan743x_adapter *adapter)
{
	struct lan743x_gpio *gpio = &adapter->gpio;

	spin_lock_init(&gpio->gpio_lock);

	gpio->gpio_cfg0 = 0; /* set all direction to input, data = 0 */
	gpio->gpio_cfg1 = 0x0FFF0000;/* disable all gpio, set to open drain */
	gpio->gpio_cfg2 = 0;/* set all to 1588 low polarity level */
	gpio->gpio_cfg3 = 0;/* disable all 1588 output */
	lan743x_csr_write(adapter, GPIO_CFG0, gpio->gpio_cfg0);
	lan743x_csr_write(adapter, GPIO_CFG1, gpio->gpio_cfg1);
	lan743x_csr_write(adapter, GPIO_CFG2, gpio->gpio_cfg2);
	lan743x_csr_write(adapter, GPIO_CFG3, gpio->gpio_cfg3);

	return 0;
}

static void lan743x_ptp_wait_till_cmd_done(struct lan743x_adapter *adapter,
					   u32 bit_mask)
{
	int timeout = 1000;
	u32 data = 0;

	while (timeout &&
	       (data = (lan743x_csr_read(adapter, PTP_CMD_CTL) &
	       bit_mask))) {
		usleep_range(1000, 20000);
		timeout--;
	}
	if (data) {
		netif_err(adapter, drv, adapter->netdev,
			  "timeout waiting for cmd to be done, cmd = 0x%08X\n",
			  bit_mask);
	}
}

static void lan743x_ptp_tx_ts_enqueue_ts(struct lan743x_adapter *adapter,
					 u32 seconds, u32 nano_seconds,
					 u32 header)
{
	struct lan743x_ptp *ptp = &adapter->ptp;

	spin_lock_bh(&ptp->tx_ts_lock);
	if (ptp->tx_ts_queue_size < LAN743X_PTP_NUMBER_OF_TX_TIMESTAMPS) {
		ptp->tx_ts_seconds_queue[ptp->tx_ts_queue_size] = seconds;
		ptp->tx_ts_nseconds_queue[ptp->tx_ts_queue_size] = nano_seconds;
		ptp->tx_ts_header_queue[ptp->tx_ts_queue_size] = header;
		ptp->tx_ts_queue_size++;
	} else {
		netif_err(adapter, drv, adapter->netdev,
			  "tx ts queue overflow\n");
	}
	spin_unlock_bh(&ptp->tx_ts_lock);
}

static void lan743x_ptp_tx_ts_complete(struct lan743x_adapter *adapter)
{
	struct lan743x_ptp *ptp = &adapter->ptp;
	struct skb_shared_hwtstamps tstamps;
	u32 header, nseconds, seconds;
	bool ignore_sync = false;
	struct sk_buff *skb;
	int c, i;

	spin_lock_bh(&ptp->tx_ts_lock);
	c = ptp->tx_ts_skb_queue_size;

	if (c > ptp->tx_ts_queue_size)
		c = ptp->tx_ts_queue_size;
	if (c <= 0)
		goto done;

	for (i = 0; i < c; i++) {
		ignore_sync = ((ptp->tx_ts_ignore_sync_queue &
				BIT(i)) != 0);
		skb = ptp->tx_ts_skb_queue[i];
		nseconds = ptp->tx_ts_nseconds_queue[i];
		seconds = ptp->tx_ts_seconds_queue[i];
		header = ptp->tx_ts_header_queue[i];

		memset(&tstamps, 0, sizeof(tstamps));
		tstamps.hwtstamp = ktime_set(seconds, nseconds);
		if (!ignore_sync ||
		    ((header & PTP_TX_MSG_HEADER_MSG_TYPE_) !=
		    PTP_TX_MSG_HEADER_MSG_TYPE_SYNC_))
			skb_tstamp_tx(skb, &tstamps);

		dev_kfree_skb(skb);

		ptp->tx_ts_skb_queue[i] = NULL;
		ptp->tx_ts_seconds_queue[i] = 0;
		ptp->tx_ts_nseconds_queue[i] = 0;
		ptp->tx_ts_header_queue[i] = 0;
	}

	/* shift queue */
	ptp->tx_ts_ignore_sync_queue >>= c;
	for (i = c; i < LAN743X_PTP_NUMBER_OF_TX_TIMESTAMPS; i++) {
		ptp->tx_ts_skb_queue[i - c] = ptp->tx_ts_skb_queue[i];
		ptp->tx_ts_seconds_queue[i - c] = ptp->tx_ts_seconds_queue[i];
		ptp->tx_ts_nseconds_queue[i - c] = ptp->tx_ts_nseconds_queue[i];
		ptp->tx_ts_header_queue[i - c] = ptp->tx_ts_header_queue[i];

		ptp->tx_ts_skb_queue[i] = NULL;
		ptp->tx_ts_seconds_queue[i] = 0;
		ptp->tx_ts_nseconds_queue[i] = 0;
		ptp->tx_ts_header_queue[i] = 0;
	}
	ptp->tx_ts_skb_queue_size -= c;
	ptp->tx_ts_queue_size -= c;
done:
	ptp->pending_tx_timestamps -= c;
	spin_unlock_bh(&ptp->tx_ts_lock);
}

static int lan743x_ptp_reserve_event_ch(struct lan743x_adapter *adapter)
{
	struct lan743x_ptp *ptp = &adapter->ptp;
	int result = -ENODEV;
	int index = 0;

	mutex_lock(&ptp->command_lock);
	for (index = 0; index < LAN743X_PTP_NUMBER_OF_EVENT_CHANNELS; index++) {
		if (!(test_bit(index, &ptp->used_event_ch))) {
			ptp->used_event_ch |= BIT(index);
			result = index;
			break;
		}
	}
	mutex_unlock(&ptp->command_lock);
	return result;
}

static void lan743x_ptp_release_event_ch(struct lan743x_adapter *adapter,
					 int event_channel)
{
	struct lan743x_ptp *ptp = &adapter->ptp;

	mutex_lock(&ptp->command_lock);
	if (test_bit(event_channel, &ptp->used_event_ch)) {
		ptp->used_event_ch &= ~BIT(event_channel);
	} else {
		netif_warn(adapter, drv, adapter->netdev,
			   "attempted release on a not used event_channel = %d\n",
			   event_channel);
	}
	mutex_unlock(&ptp->command_lock);
}

static void lan743x_ptp_clock_get(struct lan743x_adapter *adapter,
				  u32 *seconds, u32 *nano_seconds,
				  u32 *sub_nano_seconds);
static void lan743x_ptp_clock_step(struct lan743x_adapter *adapter,
				   s64 time_step_ns);

static int lan743x_gpio_rsrv_ptp_out(struct lan743x_adapter *adapter,
				     int bit, int ptp_channel)
{
	struct lan743x_gpio *gpio = &adapter->gpio;
	unsigned long irq_flags = 0;
	int bit_mask = BIT(bit);
	int ret = -EBUSY;

	spin_lock_irqsave(&gpio->gpio_lock, irq_flags);

	if (!(gpio->used_bits & bit_mask)) {
		gpio->used_bits |= bit_mask;
		gpio->output_bits |= bit_mask;
		gpio->ptp_bits |= bit_mask;

		/* set as output, and zero initial value */
		gpio->gpio_cfg0 |= GPIO_CFG0_GPIO_DIR_BIT_(bit);
		gpio->gpio_cfg0 &= ~GPIO_CFG0_GPIO_DATA_BIT_(bit);
		lan743x_csr_write(adapter, GPIO_CFG0, gpio->gpio_cfg0);

		/* enable gpio, and set buffer type to push pull */
		gpio->gpio_cfg1 &= ~GPIO_CFG1_GPIOEN_BIT_(bit);
		gpio->gpio_cfg1 |= GPIO_CFG1_GPIOBUF_BIT_(bit);
		lan743x_csr_write(adapter, GPIO_CFG1, gpio->gpio_cfg1);

		/* set 1588 polarity to high */
		gpio->gpio_cfg2 |= GPIO_CFG2_1588_POL_BIT_(bit);
		lan743x_csr_write(adapter, GPIO_CFG2, gpio->gpio_cfg2);

		if (!ptp_channel) {
			/* use channel A */
			gpio->gpio_cfg3 &= ~GPIO_CFG3_1588_CH_SEL_BIT_(bit);
		} else {
			/* use channel B */
			gpio->gpio_cfg3 |= GPIO_CFG3_1588_CH_SEL_BIT_(bit);
		}
		gpio->gpio_cfg3 |= GPIO_CFG3_1588_OE_BIT_(bit);
		lan743x_csr_write(adapter, GPIO_CFG3, gpio->gpio_cfg3);

		ret = bit;
	}
	spin_unlock_irqrestore(&gpio->gpio_lock, irq_flags);
	return ret;
}

static void lan743x_gpio_release(struct lan743x_adapter *adapter, int bit)
{
	struct lan743x_gpio *gpio = &adapter->gpio;
	unsigned long irq_flags = 0;
	int bit_mask = BIT(bit);

	spin_lock_irqsave(&gpio->gpio_lock, irq_flags);
	if (gpio->used_bits & bit_mask) {
		gpio->used_bits &= ~bit_mask;
		if (gpio->output_bits & bit_mask) {
			gpio->output_bits &= ~bit_mask;

			if (gpio->ptp_bits & bit_mask) {
				gpio->ptp_bits &= ~bit_mask;
				/* disable ptp output */
				gpio->gpio_cfg3 &= ~GPIO_CFG3_1588_OE_BIT_(bit);
				lan743x_csr_write(adapter, GPIO_CFG3,
						  gpio->gpio_cfg3);
			}
			/* release gpio output */

			/* disable gpio */
			gpio->gpio_cfg1 |= GPIO_CFG1_GPIOEN_BIT_(bit);
			gpio->gpio_cfg1 &= ~GPIO_CFG1_GPIOBUF_BIT_(bit);
			lan743x_csr_write(adapter, GPIO_CFG1, gpio->gpio_cfg1);

			/* reset back to input */
			gpio->gpio_cfg0 &= ~GPIO_CFG0_GPIO_DIR_BIT_(bit);
			gpio->gpio_cfg0 &= ~GPIO_CFG0_GPIO_DATA_BIT_(bit);
			lan743x_csr_write(adapter, GPIO_CFG0, gpio->gpio_cfg0);
		}
	}
	spin_unlock_irqrestore(&gpio->gpio_lock, irq_flags);
}

static int lan743x_ptpci_adjfine(struct ptp_clock_info *ptpci, long scaled_ppm)
{
	struct lan743x_ptp *ptp =
		container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
	struct lan743x_adapter *adapter =
		container_of(ptp, struct lan743x_adapter, ptp);
	u32 lan743x_rate_adj = 0;
	bool positive = true;
	u64 u64_delta = 0;

	if ((scaled_ppm < (-LAN743X_PTP_MAX_FINE_ADJ_IN_SCALED_PPM)) ||
	    scaled_ppm > LAN743X_PTP_MAX_FINE_ADJ_IN_SCALED_PPM) {
		return -EINVAL;
	}
	if (scaled_ppm > 0) {
		u64_delta = (u64)scaled_ppm;
		positive = true;
	} else {
		u64_delta = (u64)(-scaled_ppm);
		positive = false;
	}
	u64_delta = (u64_delta << 19);
	lan743x_rate_adj = div_u64(u64_delta, 1000000);

	if (positive)
		lan743x_rate_adj |= PTP_CLOCK_RATE_ADJ_DIR_;

	lan743x_csr_write(adapter, PTP_CLOCK_RATE_ADJ,
			  lan743x_rate_adj);

	return 0;
}

static int lan743x_ptpci_adjfreq(struct ptp_clock_info *ptpci, s32 delta_ppb)
{
	struct lan743x_ptp *ptp =
		container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
	struct lan743x_adapter *adapter =
		container_of(ptp, struct lan743x_adapter, ptp);
	u32 lan743x_rate_adj = 0;
	bool positive = true;
	u32 u32_delta = 0;
	u64 u64_delta = 0;

	if ((delta_ppb < (-LAN743X_PTP_MAX_FREQ_ADJ_IN_PPB)) ||
	    delta_ppb > LAN743X_PTP_MAX_FREQ_ADJ_IN_PPB) {
		return -EINVAL;
	}
	if (delta_ppb > 0) {
		u32_delta = (u32)delta_ppb;
		positive = true;
	} else {
		u32_delta = (u32)(-delta_ppb);
		positive = false;
	}
	u64_delta = (((u64)u32_delta) << 35);
	lan743x_rate_adj = div_u64(u64_delta, 1000000000);

	if (positive)
		lan743x_rate_adj |= PTP_CLOCK_RATE_ADJ_DIR_;

	lan743x_csr_write(adapter, PTP_CLOCK_RATE_ADJ,
			  lan743x_rate_adj);

	return 0;
}

static int lan743x_ptpci_adjtime(struct ptp_clock_info *ptpci, s64 delta)
{
	struct lan743x_ptp *ptp =
		container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
	struct lan743x_adapter *adapter =
		container_of(ptp, struct lan743x_adapter, ptp);

	lan743x_ptp_clock_step(adapter, delta);

	return 0;
}

static int lan743x_ptpci_gettime64(struct ptp_clock_info *ptpci,
				   struct timespec64 *ts)
{
	struct lan743x_ptp *ptp =
		container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
	struct lan743x_adapter *adapter =
		container_of(ptp, struct lan743x_adapter, ptp);
	u32 nano_seconds = 0;
	u32 seconds = 0;

	lan743x_ptp_clock_get(adapter, &seconds, &nano_seconds, NULL);
	ts->tv_sec = seconds;
	ts->tv_nsec = nano_seconds;

	return 0;
}

static int lan743x_ptpci_settime64(struct ptp_clock_info *ptpci,
				   const struct timespec64 *ts)
{
	struct lan743x_ptp *ptp =
		container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
	struct lan743x_adapter *adapter =
		container_of(ptp, struct lan743x_adapter, ptp);
	u32 nano_seconds = 0;
	u32 seconds = 0;

	if (ts) {
		if (ts->tv_sec > 0xFFFFFFFFLL ||
		    ts->tv_sec < 0) {
			netif_warn(adapter, drv, adapter->netdev,
				   "ts->tv_sec out of range, %lld\n",
				   ts->tv_sec);
			return -ERANGE;
		}
		if (ts->tv_nsec >= 1000000000L ||
		    ts->tv_nsec < 0) {
			netif_warn(adapter, drv, adapter->netdev,
				   "ts->tv_nsec out of range, %ld\n",
				   ts->tv_nsec);
			return -ERANGE;
		}
		seconds = ts->tv_sec;
		nano_seconds = ts->tv_nsec;
		lan743x_ptp_clock_set(adapter, seconds, nano_seconds, 0);
	} else {
		netif_warn(adapter, drv, adapter->netdev, "ts == NULL\n");
		return -EINVAL;
	}

	return 0;
}

static void lan743x_ptp_perout_off(struct lan743x_adapter *adapter)
{
	struct lan743x_ptp *ptp = &adapter->ptp;
	u32 general_config = 0;

	if (ptp->perout_gpio_bit >= 0) {
		lan743x_gpio_release(adapter, ptp->perout_gpio_bit);
		ptp->perout_gpio_bit = -1;
	}

	if (ptp->perout_event_ch >= 0) {
		/* set target to far in the future, effectively disabling it */
		lan743x_csr_write(adapter,
				  PTP_CLOCK_TARGET_SEC_X(ptp->perout_event_ch),
				  0xFFFF0000);
		lan743x_csr_write(adapter,
				  PTP_CLOCK_TARGET_NS_X(ptp->perout_event_ch),
				  0);

		general_config = lan743x_csr_read(adapter, PTP_GENERAL_CONFIG);
		general_config |= PTP_GENERAL_CONFIG_RELOAD_ADD_X_
				  (ptp->perout_event_ch);
		lan743x_csr_write(adapter, PTP_GENERAL_CONFIG, general_config);
		lan743x_ptp_release_event_ch(adapter, ptp->perout_event_ch);
		ptp->perout_event_ch = -1;
	}
}

static int lan743x_ptp_perout(struct lan743x_adapter *adapter, int on,
			      struct ptp_perout_request *perout)
{
	struct lan743x_ptp *ptp = &adapter->ptp;
	u32 period_sec = 0, period_nsec = 0;
	u32 start_sec = 0, start_nsec = 0;
	u32 general_config = 0;
	int pulse_width = 0;
	int perout_bit = 0;

	if (!on) {
		lan743x_ptp_perout_off(adapter);
		return 0;
	}

	if (ptp->perout_event_ch >= 0 ||
	    ptp->perout_gpio_bit >= 0) {
		/* already on, turn off first */
		lan743x_ptp_perout_off(adapter);
	}

	ptp->perout_event_ch = lan743x_ptp_reserve_event_ch(adapter);
	if (ptp->perout_event_ch < 0) {
		netif_warn(adapter, drv, adapter->netdev,
			   "Failed to reserve event channel for PEROUT\n");
		goto failed;
	}

	switch (adapter->csr.id_rev & ID_REV_ID_MASK_) {
	case ID_REV_ID_LAN7430_:
		perout_bit = 2;/* GPIO 2 is preferred on EVB LAN7430 */
		break;
	case ID_REV_ID_LAN7431_:
		perout_bit = 4;/* GPIO 4 is preferred on EVB LAN7431 */
		break;
	}

	ptp->perout_gpio_bit = lan743x_gpio_rsrv_ptp_out(adapter,
							 perout_bit,
							 ptp->perout_event_ch);

	if (ptp->perout_gpio_bit < 0) {
		netif_warn(adapter, drv, adapter->netdev,
			   "Failed to reserve gpio %d for PEROUT\n",
			   perout_bit);
		goto failed;
	}

	start_sec = perout->start.sec;
	start_sec += perout->start.nsec / 1000000000;
	start_nsec = perout->start.nsec % 1000000000;

	period_sec = perout->period.sec;
	period_sec += perout->period.nsec / 1000000000;
	period_nsec = perout->period.nsec % 1000000000;

	if (period_sec == 0) {
		if (period_nsec >= 400000000) {
			pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_200MS_;
		} else if (period_nsec >= 20000000) {
			pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_10MS_;
		} else if (period_nsec >= 2000000) {
			pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_1MS_;
		} else if (period_nsec >= 200000) {
			pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_100US_;
		} else if (period_nsec >= 20000) {
			pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_10US_;
		} else if (period_nsec >= 200) {
			pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_100NS_;
		} else {
			netif_warn(adapter, drv, adapter->netdev,
				   "perout period too small, minimum is 200nS\n");
			goto failed;
		}
	} else {
		pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_200MS_;
	}

	/* turn off by setting target far in future */
	lan743x_csr_write(adapter,
			  PTP_CLOCK_TARGET_SEC_X(ptp->perout_event_ch),
			  0xFFFF0000);
	lan743x_csr_write(adapter,
			  PTP_CLOCK_TARGET_NS_X(ptp->perout_event_ch), 0);

	/* Configure to pulse every period */
	general_config = lan743x_csr_read(adapter, PTP_GENERAL_CONFIG);
	general_config &= ~(PTP_GENERAL_CONFIG_CLOCK_EVENT_X_MASK_
			  (ptp->perout_event_ch));
	general_config |= PTP_GENERAL_CONFIG_CLOCK_EVENT_X_SET_
			  (ptp->perout_event_ch, pulse_width);
	general_config &= ~PTP_GENERAL_CONFIG_RELOAD_ADD_X_
			  (ptp->perout_event_ch);
	lan743x_csr_write(adapter, PTP_GENERAL_CONFIG, general_config);

	/* set the reload to one toggle cycle */
	lan743x_csr_write(adapter,
			  PTP_CLOCK_TARGET_RELOAD_SEC_X(ptp->perout_event_ch),
			  period_sec);
	lan743x_csr_write(adapter,
			  PTP_CLOCK_TARGET_RELOAD_NS_X(ptp->perout_event_ch),
			  period_nsec);

	/* set the start time */
	lan743x_csr_write(adapter,
			  PTP_CLOCK_TARGET_SEC_X(ptp->perout_event_ch),
			  start_sec);
	lan743x_csr_write(adapter,
			  PTP_CLOCK_TARGET_NS_X(ptp->perout_event_ch),
			  start_nsec);

	return 0;

failed:
	lan743x_ptp_perout_off(adapter);
	return -ENODEV;
}

static int lan743x_ptpci_enable(struct ptp_clock_info *ptpci,
				struct ptp_clock_request *request, int on)
{
	struct lan743x_ptp *ptp =
		container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
	struct lan743x_adapter *adapter =
		container_of(ptp, struct lan743x_adapter, ptp);

	if (request) {
		switch (request->type) {
		case PTP_CLK_REQ_EXTTS:
			return -EINVAL;
		case PTP_CLK_REQ_PEROUT:
			if (request->perout.index == 0)
				return lan743x_ptp_perout(adapter, on,
							  &request->perout);
			return -EINVAL;
		case PTP_CLK_REQ_PPS:
			return -EINVAL;
		default:
			netif_err(adapter, drv, adapter->netdev,
				  "request->type == %d, Unknown\n",
				  request->type);
			break;
		}
	} else {
		netif_err(adapter, drv, adapter->netdev, "request == NULL\n");
	}
	return 0;
}

static long lan743x_ptpci_do_aux_work(struct ptp_clock_info *ptpci)
{
	struct lan743x_ptp *ptp =
		container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
	struct lan743x_adapter *adapter =
		container_of(ptp, struct lan743x_adapter, ptp);
	u32 cap_info, cause, header, nsec, seconds;
	bool new_timestamp_available = false;
	int count = 0;

	while ((count < 100) &&
	       (lan743x_csr_read(adapter, PTP_INT_STS) & PTP_INT_BIT_TX_TS_)) {
		count++;
		cap_info = lan743x_csr_read(adapter, PTP_CAP_INFO);

		if (PTP_CAP_INFO_TX_TS_CNT_GET_(cap_info) > 0) {
			seconds = lan743x_csr_read(adapter,
						   PTP_TX_EGRESS_SEC);
			nsec = lan743x_csr_read(adapter, PTP_TX_EGRESS_NS);
			cause = (nsec &
				 PTP_TX_EGRESS_NS_CAPTURE_CAUSE_MASK_);
			header = lan743x_csr_read(adapter,
						  PTP_TX_MSG_HEADER);

			if (cause == PTP_TX_EGRESS_NS_CAPTURE_CAUSE_SW_) {
				nsec &= PTP_TX_EGRESS_NS_TS_NS_MASK_;
				lan743x_ptp_tx_ts_enqueue_ts(adapter,
							     seconds, nsec,
							     header);
				new_timestamp_available = true;
			} else if (cause ==
				PTP_TX_EGRESS_NS_CAPTURE_CAUSE_AUTO_) {
				netif_err(adapter, drv, adapter->netdev,
					  "Auto capture cause not supported\n");
			} else {
				netif_warn(adapter, drv, adapter->netdev,
					   "unknown tx timestamp capture cause\n");
			}
		} else {
			netif_warn(adapter, drv, adapter->netdev,
				   "TX TS INT but no TX TS CNT\n");
		}
		lan743x_csr_write(adapter, PTP_INT_STS, PTP_INT_BIT_TX_TS_);
	}

	if (new_timestamp_available)
		lan743x_ptp_tx_ts_complete(adapter);

	lan743x_csr_write(adapter, INT_EN_SET, INT_BIT_1588_);

	return -1;
}

static void lan743x_ptp_clock_get(struct lan743x_adapter *adapter,
				  u32 *seconds, u32 *nano_seconds,
				  u32 *sub_nano_seconds)
{
	struct lan743x_ptp *ptp = &adapter->ptp;

	mutex_lock(&ptp->command_lock);

	lan743x_csr_write(adapter, PTP_CMD_CTL, PTP_CMD_CTL_PTP_CLOCK_READ_);
	lan743x_ptp_wait_till_cmd_done(adapter, PTP_CMD_CTL_PTP_CLOCK_READ_);

	if (seconds)
		(*seconds) = lan743x_csr_read(adapter, PTP_CLOCK_SEC);

	if (nano_seconds)
		(*nano_seconds) = lan743x_csr_read(adapter, PTP_CLOCK_NS);

	if (sub_nano_seconds)
		(*sub_nano_seconds) =
		lan743x_csr_read(adapter, PTP_CLOCK_SUBNS);

	mutex_unlock(&ptp->command_lock);
}

static void lan743x_ptp_clock_step(struct lan743x_adapter *adapter,
				   s64 time_step_ns)
{
	struct lan743x_ptp *ptp = &adapter->ptp;
	u32 nano_seconds_step = 0;
	u64 abs_time_step_ns = 0;
	u32 unsigned_seconds = 0;
	u32 nano_seconds = 0;
	u32 remainder = 0;
	s32 seconds = 0;

	if (time_step_ns >  15000000000LL) {
		/* convert to clock set */
		lan743x_ptp_clock_get(adapter, &unsigned_seconds,
				      &nano_seconds, NULL);
		unsigned_seconds += div_u64_rem(time_step_ns, 1000000000LL,
						&remainder);
		nano_seconds += remainder;
		if (nano_seconds >= 1000000000) {
			unsigned_seconds++;
			nano_seconds -= 1000000000;
		}
		lan743x_ptp_clock_set(adapter, unsigned_seconds,
				      nano_seconds, 0);
		return;
	} else if (time_step_ns < -15000000000LL) {
		/* convert to clock set */
		time_step_ns = -time_step_ns;

		lan743x_ptp_clock_get(adapter, &unsigned_seconds,
				      &nano_seconds, NULL);
		unsigned_seconds -= div_u64_rem(time_step_ns, 1000000000LL,
						&remainder);
		nano_seconds_step = remainder;
		if (nano_seconds < nano_seconds_step) {
			unsigned_seconds--;
			nano_seconds += 1000000000;
		}
		nano_seconds -= nano_seconds_step;
		lan743x_ptp_clock_set(adapter, unsigned_seconds,
				      nano_seconds, 0);
		return;
	}

	/* do clock step */
	if (time_step_ns >= 0) {
		abs_time_step_ns = (u64)(time_step_ns);
		seconds = (s32)div_u64_rem(abs_time_step_ns, 1000000000,
					   &remainder);
		nano_seconds = (u32)remainder;
	} else {
		abs_time_step_ns = (u64)(-time_step_ns);
		seconds = -((s32)div_u64_rem(abs_time_step_ns, 1000000000,
					     &remainder));
		nano_seconds = (u32)remainder;
		if (nano_seconds > 0) {
			/* subtracting nano seconds is not allowed
			 * convert to subtracting from seconds,
			 * and adding to nanoseconds
			 */
			seconds--;
			nano_seconds = (1000000000 - nano_seconds);
		}
	}

	if (nano_seconds > 0) {
		/* add 8 ns to cover the likely normal increment */
		nano_seconds += 8;
	}

	if (nano_seconds >= 1000000000) {
		/* carry into seconds */
		seconds++;
		nano_seconds -= 1000000000;
	}

	while (seconds) {
		mutex_lock(&ptp->command_lock);
		if (seconds > 0) {
			u32 adjustment_value = (u32)seconds;

			if (adjustment_value > 0xF)
				adjustment_value = 0xF;
			lan743x_csr_write(adapter, PTP_CLOCK_STEP_ADJ,
					  PTP_CLOCK_STEP_ADJ_DIR_ |
					  adjustment_value);
			seconds -= ((s32)adjustment_value);
		} else {
			u32 adjustment_value = (u32)(-seconds);

			if (adjustment_value > 0xF)
				adjustment_value = 0xF;
			lan743x_csr_write(adapter, PTP_CLOCK_STEP_ADJ,
					  adjustment_value);
			seconds += ((s32)adjustment_value);
		}
		lan743x_csr_write(adapter, PTP_CMD_CTL,
				  PTP_CMD_CTL_PTP_CLOCK_STEP_SEC_);
		lan743x_ptp_wait_till_cmd_done(adapter,
					       PTP_CMD_CTL_PTP_CLOCK_STEP_SEC_);
		mutex_unlock(&ptp->command_lock);
	}
	if (nano_seconds) {
		mutex_lock(&ptp->command_lock);
		lan743x_csr_write(adapter, PTP_CLOCK_STEP_ADJ,
				  PTP_CLOCK_STEP_ADJ_DIR_ |
				  (nano_seconds &
				  PTP_CLOCK_STEP_ADJ_VALUE_MASK_));
		lan743x_csr_write(adapter, PTP_CMD_CTL,
				  PTP_CMD_CTL_PTP_CLK_STP_NSEC_);
		lan743x_ptp_wait_till_cmd_done(adapter,
					       PTP_CMD_CTL_PTP_CLK_STP_NSEC_);
		mutex_unlock(&ptp->command_lock);
	}
}

void lan743x_ptp_isr(void *context)
{
	struct lan743x_adapter *adapter = (struct lan743x_adapter *)context;
	struct lan743x_ptp *ptp = NULL;
	int enable_flag = 1;
	u32 ptp_int_sts = 0;

	ptp = &adapter->ptp;

	lan743x_csr_write(adapter, INT_EN_CLR, INT_BIT_1588_);

	ptp_int_sts = lan743x_csr_read(adapter, PTP_INT_STS);
	ptp_int_sts &= lan743x_csr_read(adapter, PTP_INT_EN_SET);

	if (ptp_int_sts & PTP_INT_BIT_TX_TS_) {
		ptp_schedule_worker(ptp->ptp_clock, 0);
		enable_flag = 0;/* tasklet will re-enable later */
	}
	if (ptp_int_sts & PTP_INT_BIT_TX_SWTS_ERR_) {
		netif_err(adapter, drv, adapter->netdev,
			  "PTP TX Software Timestamp Error\n");
		/* clear int status bit */
		lan743x_csr_write(adapter, PTP_INT_STS,
				  PTP_INT_BIT_TX_SWTS_ERR_);
	}
	if (ptp_int_sts & PTP_INT_BIT_TIMER_B_) {
		/* clear int status bit */
		lan743x_csr_write(adapter, PTP_INT_STS,
				  PTP_INT_BIT_TIMER_B_);
	}
	if (ptp_int_sts & PTP_INT_BIT_TIMER_A_) {
		/* clear int status bit */
		lan743x_csr_write(adapter, PTP_INT_STS,
				  PTP_INT_BIT_TIMER_A_);
	}

	if (enable_flag) {
		/* re-enable isr */
		lan743x_csr_write(adapter, INT_EN_SET, INT_BIT_1588_);
	}
}

static void lan743x_ptp_tx_ts_enqueue_skb(struct lan743x_adapter *adapter,
					  struct sk_buff *skb, bool ignore_sync)
{
	struct lan743x_ptp *ptp = &adapter->ptp;

	spin_lock_bh(&ptp->tx_ts_lock);
	if (ptp->tx_ts_skb_queue_size < LAN743X_PTP_NUMBER_OF_TX_TIMESTAMPS) {
		ptp->tx_ts_skb_queue[ptp->tx_ts_skb_queue_size] = skb;
		if (ignore_sync)
			ptp->tx_ts_ignore_sync_queue |=
				BIT(ptp->tx_ts_skb_queue_size);
		ptp->tx_ts_skb_queue_size++;
	} else {
		/* this should never happen, so long as the tx channel
		 * calls and honors the result from
		 * lan743x_ptp_request_tx_timestamp
		 */
		netif_err(adapter, drv, adapter->netdev,
			  "tx ts skb queue overflow\n");
		dev_kfree_skb(skb);
	}
	spin_unlock_bh(&ptp->tx_ts_lock);
}

static void lan743x_ptp_sync_to_system_clock(struct lan743x_adapter *adapter)
{
	struct timespec64 ts;

	ktime_get_clocktai_ts64(&ts);

	lan743x_ptp_clock_set(adapter, ts.tv_sec, ts.tv_nsec, 0);
}

void lan743x_ptp_update_latency(struct lan743x_adapter *adapter,
				u32 link_speed)
{
	switch (link_speed) {
	case 10:
		lan743x_csr_write(adapter, PTP_LATENCY,
				  PTP_LATENCY_TX_SET_(0) |
				  PTP_LATENCY_RX_SET_(0));
		break;
	case 100:
		lan743x_csr_write(adapter, PTP_LATENCY,
				  PTP_LATENCY_TX_SET_(181) |
				  PTP_LATENCY_RX_SET_(594));
		break;
	case 1000:
		lan743x_csr_write(adapter, PTP_LATENCY,
				  PTP_LATENCY_TX_SET_(30) |
				  PTP_LATENCY_RX_SET_(525));
		break;
	}
}

int lan743x_ptp_init(struct lan743x_adapter *adapter)
{
	struct lan743x_ptp *ptp = &adapter->ptp;

	mutex_init(&ptp->command_lock);
	spin_lock_init(&ptp->tx_ts_lock);
	ptp->used_event_ch = 0;
	ptp->perout_event_ch = -1;
	ptp->perout_gpio_bit = -1;
	return 0;
}

int lan743x_ptp_open(struct lan743x_adapter *adapter)
{
	struct lan743x_ptp *ptp = &adapter->ptp;
	int ret = -ENODEV;
	u32 temp;

	lan743x_ptp_reset(adapter);
	lan743x_ptp_sync_to_system_clock(adapter);
	temp = lan743x_csr_read(adapter, PTP_TX_MOD2);
	temp |= PTP_TX_MOD2_TX_PTP_CLR_UDPV4_CHKSUM_;
	lan743x_csr_write(adapter, PTP_TX_MOD2, temp);
	lan743x_ptp_enable(adapter);
	lan743x_csr_write(adapter, INT_EN_SET, INT_BIT_1588_);
	lan743x_csr_write(adapter, PTP_INT_EN_SET,
			  PTP_INT_BIT_TX_SWTS_ERR_ | PTP_INT_BIT_TX_TS_);
	ptp->flags |= PTP_FLAG_ISR_ENABLED;

	if (!IS_ENABLED(CONFIG_PTP_1588_CLOCK))
		return 0;

	snprintf(ptp->pin_config[0].name, 32, "lan743x_ptp_pin_0");
	ptp->pin_config[0].index = 0;
	ptp->pin_config[0].func = PTP_PF_PEROUT;
	ptp->pin_config[0].chan = 0;

	ptp->ptp_clock_info.owner = THIS_MODULE;
	snprintf(ptp->ptp_clock_info.name, 16, "%pm",
		 adapter->netdev->dev_addr);
	ptp->ptp_clock_info.max_adj = LAN743X_PTP_MAX_FREQ_ADJ_IN_PPB;
	ptp->ptp_clock_info.n_alarm = 0;
	ptp->ptp_clock_info.n_ext_ts = 0;
	ptp->ptp_clock_info.n_per_out = 1;
	ptp->ptp_clock_info.n_pins = 0;
	ptp->ptp_clock_info.pps = 0;
	ptp->ptp_clock_info.pin_config = NULL;
	ptp->ptp_clock_info.adjfine = lan743x_ptpci_adjfine;
	ptp->ptp_clock_info.adjfreq = lan743x_ptpci_adjfreq;
	ptp->ptp_clock_info.adjtime = lan743x_ptpci_adjtime;
	ptp->ptp_clock_info.gettime64 = lan743x_ptpci_gettime64;
	ptp->ptp_clock_info.getcrosststamp = NULL;
	ptp->ptp_clock_info.settime64 = lan743x_ptpci_settime64;
	ptp->ptp_clock_info.enable = lan743x_ptpci_enable;
	ptp->ptp_clock_info.do_aux_work = lan743x_ptpci_do_aux_work;
	ptp->ptp_clock_info.verify = NULL;

	ptp->ptp_clock = ptp_clock_register(&ptp->ptp_clock_info,
					    &adapter->pdev->dev);

	if (IS_ERR(ptp->ptp_clock)) {
		netif_err(adapter, ifup, adapter->netdev,
			  "ptp_clock_register failed\n");
		goto done;
	}
	ptp->flags |= PTP_FLAG_PTP_CLOCK_REGISTERED;
	netif_info(adapter, ifup, adapter->netdev,
		   "successfully registered ptp clock\n");

	return 0;
done:
	lan743x_ptp_close(adapter);
	return ret;
}

void lan743x_ptp_close(struct lan743x_adapter *adapter)
{
	struct lan743x_ptp *ptp = &adapter->ptp;
	int index;

	if (IS_ENABLED(CONFIG_PTP_1588_CLOCK) &&
	    ptp->flags & PTP_FLAG_PTP_CLOCK_REGISTERED) {
		ptp_clock_unregister(ptp->ptp_clock);
		ptp->ptp_clock = NULL;
		ptp->flags &= ~PTP_FLAG_PTP_CLOCK_REGISTERED;
		netif_info(adapter, drv, adapter->netdev,
			   "ptp clock unregister\n");
	}

	if (ptp->flags & PTP_FLAG_ISR_ENABLED) {
		lan743x_csr_write(adapter, PTP_INT_EN_CLR,
				  PTP_INT_BIT_TX_SWTS_ERR_ |
				  PTP_INT_BIT_TX_TS_);
		lan743x_csr_write(adapter, INT_EN_CLR, INT_BIT_1588_);
		ptp->flags &= ~PTP_FLAG_ISR_ENABLED;
	}

	/* clean up pending timestamp requests */
	lan743x_ptp_tx_ts_complete(adapter);
	spin_lock_bh(&ptp->tx_ts_lock);
	for (index = 0;
		index < LAN743X_PTP_NUMBER_OF_TX_TIMESTAMPS;
		index++) {
		struct sk_buff *skb = ptp->tx_ts_skb_queue[index];

		if (skb)
			dev_kfree_skb(skb);
		ptp->tx_ts_skb_queue[index] = NULL;
		ptp->tx_ts_seconds_queue[index] = 0;
		ptp->tx_ts_nseconds_queue[index] = 0;
	}
	ptp->tx_ts_skb_queue_size = 0;
	ptp->tx_ts_queue_size = 0;
	ptp->pending_tx_timestamps = 0;
	spin_unlock_bh(&ptp->tx_ts_lock);

	lan743x_ptp_disable(adapter);
}

static void lan743x_ptp_set_sync_ts_insert(struct lan743x_adapter *adapter,
					   bool ts_insert_enable)
{
	u32 ptp_tx_mod = lan743x_csr_read(adapter, PTP_TX_MOD);

	if (ts_insert_enable)
		ptp_tx_mod |= PTP_TX_MOD_TX_PTP_SYNC_TS_INSERT_;
	else
		ptp_tx_mod &= ~PTP_TX_MOD_TX_PTP_SYNC_TS_INSERT_;

	lan743x_csr_write(adapter, PTP_TX_MOD, ptp_tx_mod);
}

static bool lan743x_ptp_is_enabled(struct lan743x_adapter *adapter)
{
	if (lan743x_csr_read(adapter, PTP_CMD_CTL) & PTP_CMD_CTL_PTP_ENABLE_)
		return true;
	return false;
}

static void lan743x_ptp_enable(struct lan743x_adapter *adapter)
{
	struct lan743x_ptp *ptp = &adapter->ptp;

	mutex_lock(&ptp->command_lock);

	if (lan743x_ptp_is_enabled(adapter)) {
		netif_warn(adapter, drv, adapter->netdev,
			   "PTP already enabled\n");
		goto done;
	}
	lan743x_csr_write(adapter, PTP_CMD_CTL, PTP_CMD_CTL_PTP_ENABLE_);
done:
	mutex_unlock(&ptp->command_lock);
}

static void lan743x_ptp_disable(struct lan743x_adapter *adapter)
{
	struct lan743x_ptp *ptp = &adapter->ptp;

	mutex_lock(&ptp->command_lock);
	if (!lan743x_ptp_is_enabled(adapter)) {
		netif_warn(adapter, drv, adapter->netdev,
			   "PTP already disabled\n");
		goto done;
	}
	lan743x_csr_write(adapter, PTP_CMD_CTL, PTP_CMD_CTL_PTP_DISABLE_);
	lan743x_ptp_wait_till_cmd_done(adapter, PTP_CMD_CTL_PTP_ENABLE_);
done:
	mutex_unlock(&ptp->command_lock);
}

static void lan743x_ptp_reset(struct lan743x_adapter *adapter)
{
	struct lan743x_ptp *ptp = &adapter->ptp;

	mutex_lock(&ptp->command_lock);

	if (lan743x_ptp_is_enabled(adapter)) {
		netif_err(adapter, drv, adapter->netdev,
			  "Attempting reset while enabled\n");
		goto done;
	}

	lan743x_csr_write(adapter, PTP_CMD_CTL, PTP_CMD_CTL_PTP_RESET_);
	lan743x_ptp_wait_till_cmd_done(adapter, PTP_CMD_CTL_PTP_RESET_);
done:
	mutex_unlock(&ptp->command_lock);
}

static void lan743x_ptp_clock_set(struct lan743x_adapter *adapter,
				  u32 seconds, u32 nano_seconds,
				  u32 sub_nano_seconds)
{
	struct lan743x_ptp *ptp = &adapter->ptp;

	mutex_lock(&ptp->command_lock);

	lan743x_csr_write(adapter, PTP_CLOCK_SEC, seconds);
	lan743x_csr_write(adapter, PTP_CLOCK_NS, nano_seconds);
	lan743x_csr_write(adapter, PTP_CLOCK_SUBNS, sub_nano_seconds);

	lan743x_csr_write(adapter, PTP_CMD_CTL, PTP_CMD_CTL_PTP_CLOCK_LOAD_);
	lan743x_ptp_wait_till_cmd_done(adapter, PTP_CMD_CTL_PTP_CLOCK_LOAD_);
	mutex_unlock(&ptp->command_lock);
}

bool lan743x_ptp_request_tx_timestamp(struct lan743x_adapter *adapter)
{
	struct lan743x_ptp *ptp = &adapter->ptp;
	bool result = false;

	spin_lock_bh(&ptp->tx_ts_lock);
	if (ptp->pending_tx_timestamps < LAN743X_PTP_NUMBER_OF_TX_TIMESTAMPS) {
		/* request granted */
		ptp->pending_tx_timestamps++;
		result = true;
	}
	spin_unlock_bh(&ptp->tx_ts_lock);
	return result;
}

void lan743x_ptp_unrequest_tx_timestamp(struct lan743x_adapter *adapter)
{
	struct lan743x_ptp *ptp = &adapter->ptp;

	spin_lock_bh(&ptp->tx_ts_lock);
	if (ptp->pending_tx_timestamps > 0)
		ptp->pending_tx_timestamps--;
	else
		netif_err(adapter, drv, adapter->netdev,
			  "unrequest failed, pending_tx_timestamps==0\n");
	spin_unlock_bh(&ptp->tx_ts_lock);
}

void lan743x_ptp_tx_timestamp_skb(struct lan743x_adapter *adapter,
				  struct sk_buff *skb, bool ignore_sync)
{
	lan743x_ptp_tx_ts_enqueue_skb(adapter, skb, ignore_sync);

	lan743x_ptp_tx_ts_complete(adapter);
}

int lan743x_ptp_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
	struct lan743x_adapter *adapter = netdev_priv(netdev);
	struct hwtstamp_config config;
	int ret = 0;
	int index;

	if (!ifr) {
		netif_err(adapter, drv, adapter->netdev,
			  "SIOCSHWTSTAMP, ifr == NULL\n");
		return -EINVAL;
	}

	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
		return -EFAULT;

	if (config.flags) {
		netif_warn(adapter, drv, adapter->netdev,
			   "ignoring hwtstamp_config.flags == 0x%08X, expected 0\n",
			   config.flags);
	}

	switch (config.tx_type) {
	case HWTSTAMP_TX_OFF:
		for (index = 0; index < LAN743X_MAX_TX_CHANNELS;
			index++)
			lan743x_tx_set_timestamping_mode(&adapter->tx[index],
							 false, false);
		lan743x_ptp_set_sync_ts_insert(adapter, false);
		break;
	case HWTSTAMP_TX_ON:
		for (index = 0; index < LAN743X_MAX_TX_CHANNELS;
			index++)
			lan743x_tx_set_timestamping_mode(&adapter->tx[index],
							 true, false);
		lan743x_ptp_set_sync_ts_insert(adapter, false);
		break;
	case HWTSTAMP_TX_ONESTEP_SYNC:
		for (index = 0; index < LAN743X_MAX_TX_CHANNELS;
			index++)
			lan743x_tx_set_timestamping_mode(&adapter->tx[index],
							 true, true);

		lan743x_ptp_set_sync_ts_insert(adapter, true);
		break;
	default:
		netif_warn(adapter, drv, adapter->netdev,
			   "  tx_type = %d, UNKNOWN\n", config.tx_type);
		ret = -EINVAL;
		break;
	}

	if (!ret)
		return copy_to_user(ifr->ifr_data, &config,
			sizeof(config)) ? -EFAULT : 0;
	return ret;
}